ZHCSOW8 July 2022 LP5912-EP
PRODUCTION DATA
An input capacitor is required for stability. The input capacitor must be at least equal to, or greater than, the output capacitor for good load-transient performance. A capacitor of at least 1 µF must be connected between the LP5912-EP IN pin and ground for stable operation over full load-current range. Having more output than input capacitance is acceptable, as long as the input is at least 1 µF.
The input capacitor must be located no more than 1 cm from the input pin and returned to a clean analog ground. Any good-quality ceramic, tantalum, or film capacitor can be used at the input.
To ensure stable operation, good PCB practices must be employed to minimize ground impedance and keep input inductance low. If these conditions cannot be met, or if long leads connect the battery or other power source to the LP5912-EP, increase the value of the input capacitor to at least 10 µF. Also, tantalum capacitors can suffer catastrophic failures resulting from surge current when connected to a low-impedance source of power (such as a battery or a very large capacitor). If a tantalum capacitor is used at the input, the capacitor must be verified by the manufacturer to have a surge current rating sufficient for the application. There are no requirements for the equivalent series resistance (ESR) on the input capacitor, but tolerance and temperature coefficient must be considered when selecting the capacitor to ensure the capacitance remains at 1 μF ±30% over the entire operating temperature range.